Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4d94408dc79004a…

MALICIOUS

PDF

80.7 KB Created: 2021-09-24 04:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 952a501680d66e93c15302f5cb979eff SHA-1: 5b2982c4e7d3d3e59605acd8e7f009f97d0fc4dd SHA-256: d4d94408dc79004a6aa7c266e1867e55dffaa854d5e11d554239e422279739e5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to PDF files on potentially disposable or unknown domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or spread malicious links. While no scripts were explicitly extracted, the nature of the heuristics and the high ML score strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://franchiseinnovations.org/broker-site/files/files/xuvomupifejagerol.pdf
    • http://csc0851.com/userfiles/file/20210901125741_97vm3g.pdf
    • https://groupburuemas1.com/contents/files/jitadasijiw.pdf
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/40690067670.pdf
    • https://globalcareerclub.com/FCKeditor/userfiles/file/14107448648.pdf
    • http://styrexon.cz/userfiles/file/wezemofixamav.pdf
    • http://cattaneoarchitetti.it/userfiles/files/93338639073.pdf
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/jirusuruxidowenarokaja.pdf
    • http://www.sport-konyv.hu/userfiles/file/maviripasirobiw.pdf
    • https://ebmcordelles.progess.com/userfiles/file/29202216884.pdf
    • http://studionegro.net/userfiles/files/62648830162.pdf
    • http://farmina.ru/uploads/files/5689219190.pdf
    • http://www.azurwelcomeservices.com/userfiles/file/mubefoxotuzixemibi.pdf
    • http://shepardinteriordesign.com/rw/upload/file/xefokepadom.pdf
    • http://traslochimontalto.it/userfiles/files/89027736730.pdf
    • http://davcpundri.com/css/file/38723899958.pdf
    • http://studiogiovannone.com/userfiles/files/1974385261.pdf
    • https://pagodatalk.com/_UploadFile/Images/file/52034931007.pdf
    • http://studiotecniconuti.it/userfiles/files/sinatewovojiriboxek.pdf
    • http://www.gonouvellezelande.com/files/40992828383.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/4c6a9f4929f486431ba5c7671be7b81b/42254257152.pdf
    • http://kuryakyn.ru/userfiles/file/walatela.pdf
    • http://www.css-jp.com/upfile/files/2021/09/01/97042097835.pdf
    • https://icbacademy.com/upload/files/katesenel.pdf
    • http://no1sushinroll.com/uploads/files/ladubewur.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=bus+simulator+18+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5ef.bin
94e3c54eeec0f260bd6b6766ca194e68a5b06ae2955cbe58a545694c331e9b9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EF 18032 bytes
font_01_sfnt_off000104ce.bin
cb243fc927dec6d8f02512650c8cccc052b116893696070245e34232927e558b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104CE 10692 bytes
font_02_sfnt_off00011d5c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5C 16792 bytes

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